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Magnetic properties of high-t(sub c) superconductors: rigid levitation, flux pinning, thermal depinning, and fluctuation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Brandt, E. H. |
| Copyright Year | 1990 |
| Description | The levitation of high-T(sub c) superconductors is quite conspicuous: Above magnets of low symmetry a disk of these ceramics floats motionless, without vibration or rotation; it has a continuous range of stable positions and orientations as if it were stuck in sand. Some specimens may even be suspended above or below the same magnet. This fascinating stability, inherent to no other type of levitation, is caused by the pinning of magnetic flux lines by inhomogeneities inside these extreme type-2 superconductors. The talk deals with pinning of magnetic flux in these materials, with flux flow, flux creep, thermally activated depinning, and the thermal fluctuation of the vortex positions in the flux line lattice (often called flux lattice melting). Also discussed are the fluctuations of the (nearly periodic) magnetic field inside these superconductors which are caused by random pinning sites and by the finite temperature. These fluctuations broaden the van-Hove singularities observed in the density of the magnetic field by nuclear magnetic resonance and by muon spin rotation. |
| File Size | 44769 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900018482 |
| Archival Resource Key | ark:/13960/t07x1914r |
| Language | English |
| Publisher Date | 1990-04-01 |
| Access Restriction | Open |
| Subject Keyword | Solid-state Physics Magnetic Flux Creep Properties Vibration Levitation High Temperature Superconductors Ceramics Rotation Magnets Flux Pinning Vortices Muon Spin Rotation Singularity Mathematics Nuclear Magnetic Resonance Magnetic Fields Magnetic Properties Symmetry Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
